"Bollocks." Crowley huffed under his breath the minute the archangel appeared. How, exactly, did the angel find them so easily? While he'd thought about taking this information to Raphael he hadn't gone that far yet. Dealing with angels was tricky enough as it was. A majority of them went along with their 'kill on sight' instinct. He could only imagine how much more difficult it would be with an arch.
The ten second head start was more than enough. Let Castiel deal with his brother. Crowley wasn't about to stick around and risk finding out what, exactly, smiting felt like.